Would they be cleaning them out in order to have JS come back into DC now?

Oh, without a doubt. It may be that the reason this current 'Society' series even went a head was simply to plug the gap in time until DC were ready to get underway with the Rebirth JSA. And as I have said before Dan Abnett deserves full credit for his remarkable efforts in taking the burnt out dead end that the series had become and revitalising it, even if that regeneration of the world of Earth-2 came too late in time to save it at least the series ends on something of a high and is still out there somewhere in the DC multiverse ready for a future writer to return to... Abnett has granted the series a potential lease on life these last three issues that simply would not have been feasable if the book left off on the dead end of Telos' empty world and its exhausted landscape.

Politics, Power, and The Black Panther. A Commentary On Wakandan outlook and Monarchy, By Jeffrey Kahan.